public class Test2_4 {
    public static void main (String args[]) {
        long[] a={1,2,3,4};
        long[] b={100,200,300,400,500};
        b=a;
        System.out.println("数组b的长度："+b.length);
        System.out.println("b[0]="+b[0]);
    }
}
